The collisional energy transfer in Rb(5P_J)+M collisions,where M=Ne,N₂ under gas cell conditions was investigated. For collision with Ne only electronic to translational energy transfer is possible. However,in the N₂ case,electronics to vibrational or rotational transfer is important. The Rb(5P_3/2)state is excited by a tunable CW diode laser,where the laser is tuned slightly off resonance. The ratio of 5P_1/2→5S_1/2to the 5P_3/2→5S_1/2 fluorescence as a function of quenching gas pressure was measured. Using a two-state rate equation model the transfer rate coefficients from the Rb(5P_J)state was obtained. The rate coefficient for 5P_3/2→5P_1/2 transfer in collision with Ne is 1.53×10^－12cm³S^－1. Using the ratio of the 5P_1/2 to 5P_3/2 fluorescence for Ne and N₂ case,and fitting the experimental results to the rate equation analysis,we estimate that the rate coefficient for 5P_3/2→5P_1/2 transfer in collision with N₂ is 8.83×10^－11 cm³s^－1. The quenching rate coefficient of the 5P_J state is 1.25×10^－10 cm³s^－1. A qualitative explanation for the results was given.